Here is a short list of tables of the effect of gas and the amount
produced.

All is taken from "Tanks and weapons of World war 1"
Edited by Bernard Fitzsimons:

Casualties:

Nation

Non fatal Injuries

Deaths

Totals

British Empire

180597

8109

188706

France

182000

8000

190000

United States

71345

1462

72807

Italy

55373

4627

60000

Russia

419340

56000

475340

Germany

191000

9000

200000

Austria-Hungary

97000

3000

100000

Others

9000

1000

10000

Total:

1205655

91198

1296853

Apart from the American fugures, these figures are only approximate,
and do in many cases differ from the official published figures
witch, since they do not include men who died of the gas on the
battlefield, tend to be far too low